Flanged coupling



Patented Nov. 8, 1927.

UNITED STATES THOMAS MURRAY, OF BROOKLYN, NEW YORK.

ELAN GED COUPLING,

Application filed January a1, 1923. Serial No. sieoaz.

r -My invention aims to provide an improved method of applying flangeson the ends of tubular articles such as pipes, couplings and the like,The method is applicable also to various analogous problems. Theinvention includes theproduct also.

The accompanying drawings illustrate embodiments of the invention.

. Figs. Land 2 illustrate in longitudinal section the method ofapplyingto the end of a steel pipe abrass head or flange w th I an internalthread; i

Figs. 3 and 4 are similar sections illustrating the application offlanges to the ends of a tubular T;

Fig; 5 is an inside face elevation of one of the brass' members" appliedin Fig. 3.

Referring to Figsi 1 and 2, 1 is the end of a steel pipe or othertubular article on the end of which a flange is to be applied. A flangemember 2 is rovided of the desired shape with a hub- 3 Formed with anannular groove 4 in which the end of the tube 1 fits loosely. At thebottom of the groove 4 it is undercut preferably on both,sides to formrecesses 5 between which is a central projection 6. J The parts 1 and 2are clamped 1n electrodes and pressed toward each other in the mannershown by the arrows. A current is then passed through the work and theparts are softened along their adjacentpoints to a plastic or weldingconsistency.

' The softened end of the tubular member 1 is deflected by the findercutcharacter of the recess in the member 2 and' the steel is welded andspread laterally somewhat in the manner shown in Fig. 2 to form lateralears or projections 7 which also mechanically bond or lock the twopartstogether. At the same time the parts are welded to-each other tosome extent along'the contacting surfaces indicated roughly by thedotted line 8. g

The member 2 is formed with internal threads 9 either before or afterapplication of the end of the tube 1. In fact the member 2, instead ofbeing a threaded flange as shown, may be of various other shapes and mayserve various other functions than that of a coupling flange on the endof a pipe. Also, though the invention is particularly useful inproviding brass or other noncorrodible end pieces on tubular articles,yet it may be employed'in uniting articles of the same metal and of avariety of shapes and uses.

In Fig. 3 1 have shown the application of certainb'rass flanges to'thethree tubular ends of a T, the flanges being polygonalin outlineforfengagement by a wrench and to pipes, couplings or the like. The T 10is of steel or iron and the nuts 11 are pro? vided with'sockets '12 intowhich the ,ends of the part 1Q fit freely; these sockets being shapedsimilarly to those of Fig. 1 so that when. the parts are; pressedtogether and a current passed'fthrough them they will be ,united asshown' in Fig. 4, welded to the desired extent along the line 13 andwith-probeing threaded for convenient attachment...

jectingparts "14 locking or bonding the nuts to the ends of the T.

The preferred method of welding the parts together is that described inthe Murray reissue Patent No. 15,466 of October 10,.

1922, in which a current of extremely high ampere strength is appliedfor a very brief I regulated period of time; this process beingparticularly usefulfor uniting two different metals, as explained insaid reissue patent. The welding operation is controlled as to currentdensity and time and the other steps of the welding operation areregulated, so,

that-the extent of the Welding can be controlled. That is, there may beonly a weak Weld analogous to-a merely sticking together of the parts orthere may be a strong weld with substantial, interpenetration of theparts.

Likewise the pressure which the parts are forced together may vary fordifferent cases according'to the desired takeup and character/bf thejoint; Where one of the parts isbf copper or brass or other brazingmaterial the mere passing of the current will effect a union withoutsubstantial pressure of the parts together. And I may introduce abrazing material such as copper atthe base of the recess or elsewherebetween the two parts. The raised projection 13, by making a smallerarea of contact at the point where the chlef current passes,

increases the density. of the current and con-' centrates the heat atthe bottom of the recess. It is advantageous to make the groove 4 ofsubstantial depth, a depth equal to at the parts to be joined asillustrated, but to both such parts in order to produce a doublemechanical look. In fact, the shapes of the parts may be variedin agreat many ways to take advantage of the princi le of the invention. Itwill be understoo also that the recess in one part,- into which theother part is introduced, "is not necessarily a simple straight recesswith two side walls embracing the second part, but may be of variousshapes and proportions.

The weld, however, is better if one part be shaped to embrace the otherat least sufiiciently to protect the welding areas to a substantialextent from the atmosphere. By the protection of such parts from theatmosphere the oxidation and burning effect is less than if the jointsurfaces were exposed in the open air.

The product, as an article of manufacture, is'particularly usefulbecause of the combined mechanical and welded joint. The mechanicalinterlock saves strain on the weld, while the Welding of the parts makesa joint which cannot leak.

Though I have described with great particularity of detail certainembodiments of my invention, yet it is not to be understood therefromthat the invention is restricted to the particular embodiment disclosed.Various modifications thereof may be made by those skilled in the artwithout departure from the invention as defined in the following claims.

What I claim is 1. A tubular flanged article of nianufacture comprisinga tubular body and a separately formed flange member, said tubular bodyhaving an end entering an annular re- .cess in the flange member, whichrecess has parallel sides embracing the end of the tubular memberandholding it against lateral movement and has an undercut bottomportion, the tubular member being expanded at the end to enter the.undercut portion of the recess and the parts being Welded together.

2. The tubularflanged article of manu facture of claim 1, the body beingof ferrous metal and the flange member being of comparativelynon-corrodible metal.

In witness whereof, I have hereunto signed my name.

THOMAS E. MURRAY.

